- EF-Mount Lens/Full-Frame Format
- Aperture Range: f/14 to f/40
- Two Extra-Low Dispersion Elements
- One Extra Refractive Index Element
The optical design includes both extra-low dispersion and extra-refractive index elements, which help to suppress chromatic and spherical aberrations for a high degree of clarity, color accuracy, and sharpness. Manual focus control permits focusing from 1.5' to infinity, and the front of the lens has a built-in LED ring light to aid in focusing at close distances. The slim 0.2" diameter of the front of the lens barrel also offers greater opportunities for lighting subjects from the front. Additionally, the front portion of the lens is waterproof and permits working with subjects just beneath the surface of the water or in dusty or trying environments.
This "cine-mod" version of the lens has been optimized for video use and features integrated gears on both the aperture and focus rings for doing iris and focus pulls using a follow focus.